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The first shark-like chondrichthyans appeared in the oceans 400 million years ago, [1] developing into the crown group of sharks by the Early Jurassic. [2] Listed below are extant species of shark. Sharks are spread across 512 described and 23 undescribed species in eight orders. The families and genera within the orders are listed in ...
The size at birth has been reported to be 61–80 cm (2.00–2.62 ft), though observations of free-swimming juveniles as small as 57 cm (1.87 ft) long in the eastern Pacific suggest that birth size varies geographically. [14] Juvenile sharks remain in shallow water to avoid predation by larger adults. [4]
The average number of fatalities worldwide per year between 2001 and 2006 from unprovoked shark attacks is 4.3. ... Nemo and the Austin Powers series. Sharks tend to ...
• The largest size the basking shark can reach is uncertain. There are historical reports of basking sharks in the region of 12 to 15 meters (39 to 49 ft) in length, but these lack good evidence. [ 13 ] [ 8 ] [ 14 ] [ 9 ] [ 3 ] An individual reported as 40 feet 3 inches (or 12.27 meters) caught in a herring net in Musquash Harbor in 1851 is ...
Yoko, a baby swell shark, swims in a tank at Shreveport Aquarium in Shreveport, Louisiana. The shark hatched from an egg on Jan. 3, 2025. Aquarium staff are unsure how the egg came to be, as ...
The growth rate for milk sharks off Chennai have been calculated as 10 cm (3.9 in) in the first year, 9 cm (3.5 in) in the second year, 7 cm (2.8 in) in the third year, 6 cm (2.4 in) in the fourth year, 5 cm (2.0 in) in the fifth year, and 3–4 cm (1.2–1.6 in) per year from then on. [23]
A mysterious shark that may count as the world’s largest predatory fish appears to be in decline off the U.S., ... but a 35-year-old female studied by scientists proved to be immature ...
A 2015 study linking shark size and typical swimming speed estimated that megalodon would have typically swum at 18 kilometers per hour (11 mph)–assuming that its body mass was typically 48 t (53 short tons; 47 long tons)–which is consistent with other aquatic creatures of its size, such as the fin whale (Balaenoptera physalus) which ...